Lightning-arrester.



S. E. MARK.

LIGHTNING ARRBSTER.

APPLICATION FILED 001221. 1909.

INVENTOR. (2)7 Sarmue]. E Ma/I'R Patented Sept. 26, 1911.

A TTORNEY.

Fig I WITNESSES.-

COLUMBIA PLANOGRAPH co.. WASHINGTON, D. c.

SAMUEL E. MARK, OF COATESVILLE, INDIANA.

LIGHTNING-ARRESTER.

Specification of Letters Patent.

Patented Sept. 26, 1911.

Application filed Gctober 21, 1999. Serial No. 523,761.

To all whom it may concern:

Be it known that I, SAMUEL E. MARK, of Goatesville, county f Hendricks,and State of Indiana, have invented a certain new and usefulLightning-Arrester; and I do hereby declare that the following is afull, clear, and. exact description thereof, reference being had to theaccompanying drawings.

The object of this invention is to provide a practical lightningarrester adapted for use in connection with residence telephone linesand the like, and which is very simple and easy to mount and manipulate.

The nature of the invention will be understood from the accompanyingdrawings and the following description and claim.

In the drawings Figure 1 is a side elevation of a portion of a residenceshowing a telephone line with my lightning arrester in position. Fig. 2is a central longitudinal vertical section through the lightningarrester. Fig. 3 is a perspective view of a mica plate. Fig. 4; is atransverse section on the line 4% of Fig. 2. Fig. 5 is an end eleva tionof a modified form for a metallic circuit.

There is shown in the drawings herein a side 10 of a residence having amain wire 11 for a telephone line secured thereto.

The lightning arrester is provided with a bracket having a verticalportion 12 adapted to be secured to the side of a house by screws 13, ahorizontal portion 14 and a vertical arm 15 extending upwardlytherefrom. Said arm has a hole in the upper end thereof containing aring 16 of insulation, through which a metal rod 17 extends. This rod iscentrally mounted in said ring 16 and carries porcelain cylinders 18,one at each side of the insulation 16, a carbon block 19 adjacent eachporcelain cylinder 18, a metal washer 20 adjacent each carbon 19, and anut 21 that screws on each threaded end of the carbon 19 for securingall these parts together on said rod. Near each end of said rod there isa hole through which one end of the main line wire 11 extends andwhereby it is secured, so that the rod 17 constitutes part of the mainline wire conductor through which the current goes to the telephone inthe residence.

A perforated mica plate 22 partially surrounds and envelops each carboncylinder 19 excepting the lower surface thereof, and a metal plate 23surrounds the perforated mica plate 22, being cut away on the lower sidealso, as shown in Fig. 4, so that the diameter of the carbon cylinderand the plates 22 and 23 will be substantially the same as the porcelaincylinders. A. cover or casing 24 partially surrounds and envelops theporcelain cylinders and the other parts, as shown in 2, excepting on thelower side where the two sides of the casing fail to meet, so as toleave a considerable gap substantially the same as the gap between thetwo ends of the mica plates, but there are ears 25 projecting down fromeach side of the casing, which are brought together by the bolt 26, withwhich the ground wire 27 is connected. There may be two ground wires,one connected with each pair of ears 25. The length of the casing ispreferably somewhat greater than the length of the rod 17. The purposeof this casing construction is to prevent rain and water resulting fromrain from coming in contact with the parts within the casing so as toshort-circuit the main line wires with the ground wire. The rain willdrip off each side edge of the casing so that the parts therein arethoroughly protected and there is no way for the line to become groundedby rain or water falling thereon.

The parts are very easily assembled, as they all slip on the rods 17 andthe casing loosely surrounds the parts therein and is clamped thereon bythe bolts 26.

VJhen the current through the main lines is too strong it jumps from thecarbon cylinders 19 through the perforations of the mica plates to thecasing 24 and goes to ground through the wire 27.

The modified form shown in Fig. 5 is for use in metallic circuits, thecasing 24 and contents being duplicated for each side of the circuit.One ground wire for both sides of the device will suiiice, there being aconnection 28 from one casing to the ground wire that leads from theother casing. There are two arms 15 instead of one in the single device.

What I claim as my invention and desire to secure by Letters Patent is:

A lightning arrester including a bracket, a rod secured therein andinsulated therefrom that is adapted to be connected with the main linewire so that the current will pass normally therethrough, a porcelaincylinder on said rod on each side of said bracket, a carbon cylinder onsaid rod beside each porcelain cylinder, a perforated mica platesurrounding all of each of the carbon cylinders excepting the lowerportion thereof, a casing surrounding all of said porcelain and carboncylinders excepting the lower part thereof projecting beyond the end ofsaid rod, and a Wire leading from the casing to the ground.

In Witness whereof, I have hereunto affixed my signature in the presencef the Witnesses herein named.

SAMUEL E. MARK.

Witnesses SARAH E. WALTON, JOHN S. \VALTON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington. D. G.

